3 Answers

I would assume that ElasticCache Redis are controlled by standard security groups in AWS? If possible - it's ideal to whitelist the entire Databricks VPC range. If you log into AWS and find the Databricks VPC - you can look up the "VPC CIDR" IP Address range there.

@vida: Elasticache redis instances use Cache security groups, which are distinct from standard security groups. A cache security group is allowed to only whitelist other EC2 security groups. I couldn't find any option to whitelist a CIDR IP range

EC2 Secutiry groups support whitelisting a CIDR IP range. Could you try creating a security group and whitelisting a CIDR IP range there, and then adding that security group to your cache security group?